From 4ee6908ccdbfbc860ef69dae37debd51cdf0d446 Mon Sep 17 00:00:00 2001 From: Samuel Thibault Date: Sat, 30 Jun 2012 23:55:24 -0300 Subject: Add nr_irqs * libdde_linux26/lib/src/kernel/irq/handle.c: New file. * libdde_linux26/lib/src/Makefile (SRC_C_libdde_linux26.o.a): Add handle.c --- libdde_linux26/lib/src/Makefile | 1 + 1 file changed, 1 insertion(+) (limited to 'libdde_linux26/lib/src/Makefile') diff --git a/libdde_linux26/lib/src/Makefile b/libdde_linux26/lib/src/Makefile index 358196bb..6f3e246e 100644 --- a/libdde_linux26/lib/src/Makefile +++ b/libdde_linux26/lib/src/Makefile @@ -98,6 +98,7 @@ SRC_C_libdde_linux26.o.a += \ kernel/timer.c \ kernel/wait.c \ kernel/workqueue.c \ + kernel/irq/handle.c \ lib/bitmap.c \ lib/bitrev.c \ lib/crc32.c \ -- cgit v1.2.3 From 12f4d11afaf66268f4b8ac58ebd62f9d63f48a92 Mon Sep 17 00:00:00 2001 From: Samuel Thibault Date: Sun, 1 Jul 2012 00:32:31 -0300 Subject: Add dma resource management * contrib/kernel/dma.c: New file. * lib/src/Makefile (SRC_C_libdde_linux26.o.a): Add kernel/dma.c --- libdde_linux26/contrib/kernel/dma.c | 161 ++++++++++++++++++++++++++++++++++++ libdde_linux26/lib/src/Makefile | 1 + 2 files changed, 162 insertions(+) create mode 100644 libdde_linux26/contrib/kernel/dma.c (limited to 'libdde_linux26/lib/src/Makefile') diff --git a/libdde_linux26/contrib/kernel/dma.c b/libdde_linux26/contrib/kernel/dma.c new file mode 100644 index 00000000..f903189c --- /dev/null +++ b/libdde_linux26/contrib/kernel/dma.c @@ -0,0 +1,161 @@ +/* + * linux/kernel/dma.c: A DMA channel allocator. Inspired by linux/kernel/irq.c. + * + * Written by Hennus Bergman, 1992. + * + * 1994/12/26: Changes by Alex Nash to fix a minor bug in /proc/dma. + * In the previous version the reported device could end up being wrong, + * if a device requested a DMA channel that was already in use. + * [It also happened to remove the sizeof(char *) == sizeof(int) + * assumption introduced because of those /proc/dma patches. -- Hennus] + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + + + +/* A note on resource allocation: + * + * All drivers needing DMA channels, should allocate and release them + * through the public routines `request_dma()' and `free_dma()'. + * + * In order to avoid problems, all processes should allocate resources in + * the same sequence and release them in the reverse order. + * + * So, when allocating DMAs and IRQs, first allocate the IRQ, then the DMA. + * When releasing them, first release the DMA, then release the IRQ. + * If you don't, you may cause allocation requests to fail unnecessarily. + * This doesn't really matter now, but it will once we get real semaphores + * in the kernel. + */ + + +DEFINE_SPINLOCK(dma_spin_lock); + +/* + * If our port doesn't define this it has no PC like DMA + */ + +#ifdef MAX_DMA_CHANNELS + + +/* Channel n is busy iff dma_chan_busy[n].lock != 0. + * DMA0 used to be reserved for DRAM refresh, but apparently not any more... + * DMA4 is reserved for cascading. + */ + +struct dma_chan { + int lock; + const char *device_id; +}; + +static struct dma_chan dma_chan_busy[MAX_DMA_CHANNELS] = { + [4] = { 1, "cascade" }, +}; + + +/** + * request_dma - request and reserve a system DMA channel + * @dmanr: DMA channel number + * @device_id: reserving device ID string, used in /proc/dma + */ +int request_dma(unsigned int dmanr, const char * device_id) +{ + if (dmanr >= MAX_DMA_CHANNELS) + return -EINVAL; + + if (xchg(&dma_chan_busy[dmanr].lock, 1) != 0) + return -EBUSY; + + dma_chan_busy[dmanr].device_id = device_id; + + /* old flag was 0, now contains 1 to indicate busy */ + return 0; +} /* request_dma */ + +/** + * free_dma - free a reserved system DMA channel + * @dmanr: DMA channel number + */ +void free_dma(unsigned int dmanr) +{ + if (dmanr >= MAX_DMA_CHANNELS) { + printk(KERN_WARNING "Trying to free DMA%d\n", dmanr); + return; + } + + if (xchg(&dma_chan_busy[dmanr].lock, 0) == 0) { + printk(KERN_WARNING "Trying to free free DMA%d\n", dmanr); + return; + } + +} /* free_dma */ + +#else + +int request_dma(unsigned int dmanr, const char *device_id) +{ + return -EINVAL; +} + +void free_dma(unsigned int dmanr) +{ +} + +#endif + +#ifdef CONFIG_PROC_FS + +#ifdef MAX_DMA_CHANNELS +static int proc_dma_show(struct seq_file *m, void *v) +{ + int i; + + for (i = 0 ; i < MAX_DMA_CHANNELS ; i++) { + if (dma_chan_busy[i].lock) { + seq_printf(m, "%2d: %s\n", i, + dma_chan_busy[i].device_id); + } + } + return 0; +} +#else +static int proc_dma_show(struct seq_file *m, void *v) +{ + seq_puts(m, "No DMA\n"); + return 0; +} +#endif /* MAX_DMA_CHANNELS */ + +static int proc_dma_open(struct inode *inode, struct file *file) +{ + return single_open(file, proc_dma_show, NULL); +} + +static const struct file_operations proc_dma_operations = { + .open = proc_dma_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static int __init proc_dma_init(void) +{ + proc_create("dma", 0, NULL, &proc_dma_operations); + return 0; +} + +__initcall(proc_dma_init); +#endif + +EXPORT_SYMBOL(request_dma); +EXPORT_SYMBOL(free_dma); +EXPORT_SYMBOL(dma_spin_lock); diff --git a/libdde_linux26/lib/src/Makefile b/libdde_linux26/lib/src/Makefile index 6f3e246e..aa20c27d 100644 --- a/libdde_linux26/lib/src/Makefile +++ b/libdde_linux26/lib/src/Makefile @@ -85,6 +85,7 @@ endif # + contrib stuff / slightly modified stuff SRC_C_libdde_linux26.o.a += \ + kernel/dma.c \ kernel/exit.c \ kernel/kthread.c \ kernel/mutex.c \ -- cgit v1.2.3 From cc1d1c5b3b941ae16a55a54040c674e218afae0f Mon Sep 17 00:00:00 2001 From: Samuel Thibault Date: Sun, 1 Jul 2012 00:35:04 -0300 Subject: Add boot_cpu_data * lib/src/arch/x86/kernel/setup.c: New file * lib/src/Makefile (SRC_C_libdde_linux26.o.a): Add kernel/setup.c --- libdde_linux26/lib/src/Makefile | 1 + libdde_linux26/lib/src/arch/x86/kernel/setup.c | 114 +++++++++++++++++++++++++ 2 files changed, 115 insertions(+) create mode 100644 libdde_linux26/lib/src/arch/x86/kernel/setup.c (limited to 'libdde_linux26/lib/src/Makefile') diff --git a/libdde_linux26/lib/src/Makefile b/libdde_linux26/lib/src/Makefile index aa20c27d..4f1ec099 100644 --- a/libdde_linux26/lib/src/Makefile +++ b/libdde_linux26/lib/src/Makefile @@ -62,6 +62,7 @@ SRC_S_libdde_linux26.o.a += $(ARCH_DIR)/lib/delay.o SRC_C_libdde_linux26.o.a += lib/rwsem.c SRC_C_libdde_linux26.o.a += $(ARCH_DIR)/kernel/pci-dma.c SRC_C_libdde_linux26.o.a += $(ARCH_DIR)/kernel/pci-nommu.c +SRC_C_libdde_linux26.o.a += $(ARCH_DIR)/kernel/setup.c SRC_S_libdde_linux26_net.a += $(ARCH_DIR)/lib/checksum_32.S endif diff --git a/libdde_linux26/lib/src/arch/x86/kernel/setup.c b/libdde_linux26/lib/src/arch/x86/kernel/setup.c new file mode 100644 index 00000000..ef285c0d --- /dev/null +++ b/libdde_linux26/lib/src/arch/x86/kernel/setup.c @@ -0,0 +1,114 @@ +/* + * Copyright (C) 1995 Linus Torvalds + * + * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999 + * + * Memory region support + * David Parsons , July-August 1999 + * + * Added E820 sanitization routine (removes overlapping memory regions); + * Brian Moyle , February 2001 + * + * Moved CPU detection code to cpu/${cpu}.c + * Patrick Mochel , March 2002 + * + * Provisions for empty E820 memory regions (reported by certain BIOSes). + * Alex Achenbach , December 2002. + * + */ + +/* + * This file handles the architecture-dependent parts of initialization + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include + +#include +#include + +#include